terrain generator

from pygame import *
import random
init()

width = 1000

height = 1000

screen = display.set_mode((width, height))

clock = time.Clock()

# ------------------------------------------------------------------------------------------
class map():
    def __init__(self):
        self.map = [[0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
                    [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]


        self.dirtImg = image.load("dirt.jpg")

        self.dirtImg = transform.scale(self.dirtImg, (100, 100))

        self.goldImg = image.load("gold.png")

        self.goldImg = transform.scale(self.goldImg, (100, 100))

        self.gold = random.randint(1,10)

    def createterrain(self):
        posx = 0
        posy = 0
        while posx < 10 and posy < 10:
            self.map[posx][posy] = "D"
            posx = posx + 1
            while posx == 10:
                posx = 0
                posy = posy + 1

        posx = 0
        posy = 0

        while posx < 10 and posy < 10:
            if self.gold == 1:
                self.map[posx][posy] = "G"
            self.gold = random.randint(1, 5)
            posx = posx + 1
            while posx == 10:
                posx = 0
                posy = posy + 1

        return self.map

    def display(self,screen):
        posx = 0
        posy = 0
        self.x = 0
        self.y = 100
        while posx < 10 and posy < 10:
            if self.map[posy][posx] == "D":
                screen.blit(self.dirtImg,(self.x,self.y))
            if self.map[posy][posx] == "G":
                screen.blit(self.goldImg,(self.x,self.y))
            posx = posx + 1
            self.x = self.x + 100

            while posx == 10:
                posx = 0
                self.x = 0
                self.y = self.y + 100
                posy = posy + 1


screen.fill((0, 0, 0))
world = map()
world.createterrain()
world.display(screen)


game = True
while game == True:

    for e in event.get():
        if e.type == constants.QUIT: # to quit game (close tab)
            game = False

        if e.type == KEYDOWN:

            if e.key == K_RIGHT:
                world.createterrain()
                world.display(screen)

    display.flip()


    clock.tick(60)